3 years & up. The possible aircraft configurations are limitless with this set. Children can design and build jets, helicopters, planes or anything else they can imagine with this 70+ piece kit. Use the included book for additional ideas and design information. The Build an Aircraft STEM Kit builds on children's natural curiosity by providing the materials and freedom to explore. The dowels, rods, connectors, blocks, wheels, and pins provide endless opportunities for child-guided learning. Children should be encouraged to build, create, and invent on their own. Experimentation and use of the included materials can be encouraged in small groups or for independent learning.